The service procedure is well documented elsewhere - so not going to cover it here other than a link to the ZF guide I scanned in - but hopefully some useful info.
Kit Part Numbers
- 1058.298.047 is the ZF service kit with oil
- 1058.298.049 is the ZF service kit without oil
These are the official ZF docs. Note that despite Audi saying sealed for life, ZF do specify servicing - for ALL the 5HP and 6HP gearboxes. Gave the sump a lick of paint while it was out. Bit of a quick and dirty job TBH, but want to stop it rusting. Will get a replacement powdercoated when I can find one. The ZF Kit. Note that you get new magnets and sump plug included. I remember someone asking some time back if Filtran filters are OK. Filtran is the filter that ZF use - must be OK. It's well discussed that the 5HP24 A should have the short filter - but I couldn't find any measurement to confirm what the right filter length is.
20mm is the (right) number. 25mm is the wrong (long) number.
The gotcha is that the long filter will just fit in a short sump - but with no clearance. Although I've never actually seen a long filter - do they still even make them? All bolted up and looking OK